is there a way to draw an inventory grid on screen?

[NiLSPACE]

I'm uncertain what exactly you want, but I think you either and to open an inventory or show a scoreboard.

• Here is documentation on how to open an inventory: http://mc-server.xoft.cz/LuaAPI/cLuaWindow.html
  
• And here is documentation on how the scoreboard works: http://mc-server.xoft.cz/LuaAPI/cScoreboard.html
  

but sadly the scoreboard is global for all players. We don't have a per-player scoreboard yet